SpaceChem per Steam gratis su PCGamer.com
(https://forum.freeplaying.it/proxy.php?request=http%3A%2F%2Fi.imgur.com%2FAyqcaqw.jpg&hash=3bbed62ae8a312e0c4d9145a1729a637d9b110a1)
Link:
http://www.pcgamer.com/2014/06/25/we-have-one-million-spacechem-steam-keys-to-give-away-with-bundle-stars/